BIGLKNM Billet Aluminum Water Neck Thermostat Housing for Mopar Chrysler Dodge 273-440

Overview

Introducing the BIGLKNM Billet Aluminum Water Neck Thermostat Housing, a purpose-built upgrade for Mopar V-8 engines from 1957 to 1980. This part supports a family of engines including 273, 318, 340, 360, 361, 383, 400, 413, 426W, and 440, suitable for both small-block and big-block Mopar water neck locations. The design emphasizes a precise fit, durable construction, and an efficient coolant path that can suit classic builds and modern upgrades alike.

The housing is machined from billet aluminum and finished for lasting durability. A smooth mating surface helps form a reliable seal when used with the included gasket, while a robust neck helps maintain steady coolant flow under varied driving conditions. The result is a resilient component that complements the engine bay aesthetics and performance expectations of Mopar enthusiasts.

What’s Included

• 1x gasket (non-asbestos)
• 2x stainless steel screws
• 1x billet aluminum water neck thermostat housing

Material, Finish, and Fit

Crafted from billet aluminum with a corrosion-resistant finish, this housing combines rigidity with a refined appearance. The machining is designed to deliver a smooth surface that aids sealing against the included gasket, while the stainless steel screws help secure a solid, leak-conscious installation.

Key Benefits and Use Cases

• Durable billet aluminum construction provides a solid mounting surface for Mopar water necks.
• Corrosion-resistant finish helps sustain appearance and performance over time.
• Includes gasket and hardware, simplifying the swap on compatible engines.
• Designed to align with Mopar engine layouts, supporting straightforward installation for both vintage and refreshed setups.

Notes and Guidance

Verify your engine model against the listed compatibility before purchase. We are committed to providing each customer with a higher standard of customer service and are available to assist with fitment questions or concerns.

Real-world Scenarios

For classic restorations or performance-oriented projects, this billet housing offers a sturdy upgrade that integrates with existing Mopar cooling systems. While results can vary, the combination of precise fit, included gasket, and durable hardware supports a confident seal and stable cooling flow when paired with compatible components.